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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div id="code">
        var sum = 0;
        for(var i = 1; i <= 100; i++) { sum +=i; } return sum; </div>
    <script>
        var fun = new Function('console.log("这是函数 fun")');
        fun();
        function getSum(a, b) { };
        var getSum2 = new Function('num1', 'num2', 'return num1+num2;');
        console.log(getSum2(30, 15));
        var getSum4 = new Function(
            'var sum = 0;' + 
            'for (var i = 1; i <= 10; i++) {' + 
            'sum += i;' +
            '}' +
            'return sum;'
            )
            console.log(getSum4());
             var ele = document.getElementById('code');
             var text = ele.innerText;
             console.log(text);
             var getSum5 = new Function(text);
             console.log(getSum5());
             
    </script>
</body>

</html>